Super Mario Bros. + Duck Hunt

Infinite Ammo

It rains "200 point" icons

Timer counts up instead of down!!

Jump as high as you want! Works while standing, running, or turbo running!

Enemies can go thru pipes, walls, and blocks! Mario as usual can't go thru pipes, walls, or blocks.

Mario can jump higher when walking, running, or turbo running! Also, he jumps further only when normal running.

Once you turn into Fire Mario, you will always be able to shoot fireballs, even if you turn small again until you die.

The pipes you can't go down are upside-down, the pipes you can go down are normal.

Take no damage from most enemies!

Similar to "Take no damage from most enemies!" code

"Level Select" code!!

Mario can swim everywhere, and you start some worlds about 1/2 way thru

Time starts at 900 instead of 400

Start with 400 more seconds, and invincibility for the first 10 seconds.

Mario skates like gumby

Opens route to minus world! at end of 1-2

Mario always walks crouched down

Mario turns big when he walks

Mario walks right thru enemies

Everything is invisible except mario & enemies

Mario starts out swimming

You can position Mario anywhere on the screen even when he's moving by holding down the "A" button on controller #2.

You can jump over the castle at the end of world 1-1 and keep on going. Also, going down tubes does weird things.

Most enemies are invisible, but they die when you touch them.

Enemies don't die when you jump on them, so by jumping on the same one over and over, you get several 1 up's. But shooting them does kill them.

Take no damage from touching enemies!

Items that were worth 1,000 points, are now worth 1,000,000,000 points!!

Time starts at 150 instead of 400 plus about 30 seconds of invincibility at the start of every life

Time starts with one extra minute 460 instead of 400

Time starts at 600 instead of 400 plus about 10 seconds of invincibility at the start of every life

Time starts at 995 instead of 400 plus about 20 seconds of invincibility at the start of every life

Most enemies are gone

All enemies are gone!

Little mario turns big when he jumps

Big mario turns little when he jumps

When little mario walks, he turns big, little, big, little, big, little, etc...

Mario has a seizure when he walks his legs move much faster than he's walking.

Play as Game Boy mario (everything is black & white)

When mario jumps while running, his little legs start running in mid air.

Everything is offset by about 2 inches

Mario turns into the invisible man

Play at night

Invincibility! Let an enemy touch you and see what happens.

Most enemies are frozen!

Swim without water (you're always swimming)

Super mega jump, standing start only

Mario has semi lunar descent

Slow-motion, plus other neat stuff

No enemies, or in different places

Mario has variable jump heights. Sometimes he jumps high, sometimes low.

Similar to above code

Mario swims in some worlds (and different enemies)

Mario can't shoot

Mario walks past castle at end of 1-1 and keeps on going forever

All castles are missing, but game still plays normally.

After the first pipe, mario keeps on going forever (no obsticles)

Enemies follow you!

Invincibility! Mario walks right thru enemies

Mario can float for a very long time

X-ray vision bizarre. Shows where hidden blocks are.

If you press the "A" button, you can position Mario anywhere on the screen. If you don't press the "A" button, the screen won't scroll

Enemies that are up on blocks don't fall down and other oddities

Infinite Ammo

Always Hit The Duck In Single-Duck Mode

Always Advance To The Next Round (Miss All Of The Targets To Get The Perfect Bonus)

Get The Perfect Bonus For Hitting At Least 10 Targets

Always Get The Perfect Bonus

Get The Perfect Bonus Only For Hitting 20 Targets

Game D enabled

Always Clear The Level In Duck Hunt

Always Clear The Level In Clay Shooting

Duck Won't Fly Away

Ducks Fly Away Faster - Game A

Ducks Never Fly Away - Game A

Hit Anywhere

Mario Modifier

Invincible (Walk Through Enemies)

Invincible (Kill Enemies On Contact)

Infinite Time

Enable Hard Mode

Mario Always Moves As If He Has Gotten A Running Start

Coins Modifier (Tens Digit)

Coins Modifier (Seconds Digit)

Level Text Modifier (i.e. 1-1, 1-2)

Max High Score (Tens)

Max High Score (Hundreds)

Max High Score (Thousands)

Max High Score (Millions)

Max High Score (Billions)

Max High Score (Trillions)

Round Modifier

Max High Score (Ones)

Max High Score (Tens)

Max High Score (Hundreds)

Max High Score (Thousands)

Max High Score (Ten Thousands)

Max High Score (Hundred Thousands)

Disable Audio

Always Run

Always Walk Slowly (Right Direction)

Walk On Air (After Jumping)

Walk On Air After Jumping (Alt)

Walk Thru Objects (Right Direction)

Air Bubbles Come Out Of Mario

No Enemies

Less Enemies

Enemies And Powerups Can't Move

Always Walk Slowly

Jump Thru Blocks

Start Off As Big Mario And Mushrooms Make You Small (Visually Only)

Blocks Turn Invisible After Hitting Them

Infinite Time

Change Stage Layout

Double Mushroom Enemies Are Super Fast

Enemies Are Toad

Enemies Are Bullet Bill

Enemies Look Like Spring Boards

Enemies Are Upside Down

Walk Thru Enemies And Powerups

Walk Thru Enemies And Powerups (Alt)

Enemies And Powerups Don't Fall; Enemies Can Walk Thru Objects

Enemies Don't Die When You Jump On Them And Powerups Don't Fall

Enemies Fall Through The Floor

Enemies Don't Die When You Jump On Them Enemies Can Walk Thru Objects And Powerups Fall Down Fast

Enemies Can't Move

Enemies Fall Thru The Floor And Powerups Don't Fall

Jump Like You're Swimming

Jump Like Your Crouching

Enemies Are Powerups

Invulnerability (Walk Thru Enemies)

Automatically Jump On Enemies (Alt)

Jumping On Enemies Are Worth 1000 Points

Jumping On Enemies Causes Them To Instantly Disappear

Squished Enemies Can Get Back Up

Clouds, Trees, Fences In Underground Stages; Clear Skys On Stages That Normally Have Clouds, Trees, Fences

The Ground Is Clouds

Breakable Blocks Are Clouds

No Enemies (Alt)

Single Mushroom Enemies Are The Black Beetles

Enemies Are (Glitchy Looking) Bowsers

Enemies Are Upside Down (Alt)

Powerups Don't Fall

Enemies Die When They Touch You

Can Continue Jumping On A Squished Enemy (Easy 1ups)

Can Continue Jumping On A Squished Enemy (alt)

Jumping On An Enemy Gives You Points, But Does Not Kill Them

Squished Mushrooms Can Be Kicked Like Turtle Shells

All Blocks Give Coins

All ? Boxes Give 1ups

Powerups Don't Move

Some Powerups Don't Move

Walk Thru Walls, Pipes Etc.

Double Mushroom Enemies Are The Black Beetles

Instantly Go Down Pipes

Little Mario Wears Fire Suit, Fire Mario Wears Normal Suit

Black Background Is Blue Sky

Pipes, Trees, Shrubs and Hills Are Red Instead Of Green

Enemies Are (Headless) Bowsers

Swim On Land

Going Down The Very First Pipe In The Game Takes You To A Far Away Land

The Very First Pipe In The Game Takes You To World 3-1

Look Like Luigi Until You Get Firepower

Vines Grow Inside And Outside Pipes After Going Thru Them

Falling Into Pits Takes You Inside Of Pipes (But You Can Get Stuck)

Enemies That Fall From One Platform To A Lower One Die

Automatically Jump On Enemies

Walk Thru Enemies

Walk Thru Enemies (alt)

Turtles Are Toad

You Die If You're Hit Once

Invincibility Star Stay's Put

Shoot 2 Fireballs At Once

Fireballs Don't Bounce

Invincibility Star Does Not Bounce, Firepower Plant Moves Like Mushroom Powerups

Invincibility Star Moves Horizontally

Invincibility Stars Give Extra Live Instead

Automatically Shoot Fireballs (Unless holding B)

World Select

Demo Mode

Always Walkbackwards

Mario And Enemies Wont Turn Around

Play unused Game Over variation everywhere